Outdoor activity and myopia progression in 4-year follow-up of Chinese primary school children: The Beijing Children Eye Study

Yin Guo; Li Juan Liu; Ping Tang; Yan Yun Lv; Yi Feng; Liang Xu; Jost B. Jonas

doi:10.1371/journal.pone.0175921

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Peer-reviewed

Research Article

Outdoor activity and myopia progression in 4-year follow-up of Chinese primary school children: The Beijing Children Eye Study

Yin Guo,

Affiliations Beijing Institute of Ophthalmology, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China, Tongren Eye Care Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China
⨯
Li Juan Liu,

Affiliation Beijing Institute of Ophthalmology, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China
⨯
Ping Tang,

Affiliation Tongren Eye Care Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China
⨯
Yan Yun Lv,

Affiliation Tongren Eye Care Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China
⨯
Yi Feng,

Affiliation Tongren Eye Care Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China
⨯
Liang Xu ,

* E-mail: xlbio1@163.com

Affiliation Beijing Institute of Ophthalmology, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China
⨯
Jost B. Jonas

Affiliations Beijing Institute of Ophthalmology, Beijing Key Laboratory of Ophthalmology and Visual Sciences, Beijing Tongren Eye Center, Beijing Tongren Hospital, Capital Medical University, Beijing, China, Department of Ophthalmology, Medical Faculty Mannheim of the Ruprecht-Karls-University Heidelberg, Mannheim, Germany

http://orcid.org/0000-0003-2972-5227

⨯

Outdoor activity and myopia progression in 4-year follow-up of Chinese primary school children: The Beijing Children Eye Study

Yin Guo,
Li Juan Liu,
Ping Tang,
Yan Yun Lv,
Yi Feng,
Liang Xu,
Jost B. Jonas

Published: April 27, 2017
https://doi.org/10.1371/journal.pone.0175921

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Violet light vs. ultra-violet light

Posted by KazuoTsubota on 11 Aug 2017 at 01:18 GMT

Dear Yin Guo and associates,

I read your paper with great interest, and noticed that you mentioned greater ultra-violet light is related to the suppression of myopia and cited our paper (Ref. 33) in the Discussion. I would like to clarify that our paper is not focused on ultra-violet light, but violet light itself.

Violet light (360 to 400 nanometers) is visible to most people. However, conventionally it is also deemed as ultra-violet, in particular, ultra-violet A from 315 to 400nm wavelength. International Lighting Vocabulary of CIE (Commission Internationale de l’Eclairage) lists these definitions at http://eilv.cie.co.at/.

The point I would rather make in our paper is that our lifestyle in modern society depletes violet light due to overprotection from ultra-violet light through manmade materials such as window glass, LEDs and most eyeglasses.

Thank you for your understanding.

Kazuo Tsubota, MD, PhD
Prof. & Chair
Department of Ophthalmology
Keio University School of Medicine
Tokyo, Japan

No competing interests declared.

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Outdoor activity and myopia progression in 4-year follow-up of Chinese primary school children: The Beijing Children Eye Study

Outdoor activity and myopia progression in 4-year follow-up of Chinese primary school children: The Beijing Children Eye Study

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Violet light vs. ultra-violet light

Posted by KazuoTsubota on 11 Aug 2017 at 01:18 GMT